<template>
  <div>
    <!-- 面包屑  -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!--提示区  -->
      <el-alert title="消息提示的文案" type="info" effect="dark" center show-icon :closable="false">
      </el-alert>
      <!-- 步骤条区 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!--form表单  -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-position="top" label-width="100px">
        <!-- tabs标签页 -->
        <el-tabs @tab-click='tabClicked' :before-leave='befotrTabLeave' v-model="activeIndex" tab-position="left">
          <!-- 渲染表单的基本信息 -->
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input type='number' v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input type='number' v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input type='number' v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader expand-trigger='hover' v-model="addForm.goods_cat" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <!-- 渲染表单的商品参数 -->
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key='item.attr_id'>
              <!-- 复选框 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="( cb,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <!-- 渲染表单的商品属性 -->
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <!-- 渲染表单的商品图片 -->
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片上传的api后台地址 -->
            <el-upload :on-success="handleSuccess" :headers="headerObj" :action="uplaodURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <!-- 渲染表单的商品内容 -->
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button @click="add" class="btnAdd" type="primary">添加商品</el-button>
          </el-tab-pane>

        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览效果 -->
    <el-dialog title="提示" :visible.sync="previewVisible" width="50%">
      <img class="previewImg" :src="previewPath" alt="">
      </span>
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  name: 'Add',
  components: {},
  data () {
    return {
      //步骤条的完成度
      activeIndex: '0',
      //表单数据
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        //存放图片的数组
        pics: [],
        //商品详情描述
        goods_introduce: '',
        //存放动态参数和静态属性的对象
        attrs: [],
      },
      //表单验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ]
      },
      //商品分类列表
      catelist: [],
      //props的数据源规则
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      //动态参数列表数据
      manyTableData: [],
      //静态列表数据
      onlyTableData: [],
      //上传的url地址
      uplaodURL: "https://lianghj.top:8888/api/private/v1/upload",
      //图片上传组件的请求对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      //图片的路径
      previewPath: '',
      //图片预览的显示与隐藏
      previewVisible: false,






    }
  },
  created () {
    this.getCateList()

  },
  methods: {
    //获取所有商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类失败');
      }
      this.catelist = res.data

    },
    //级联选择器选中项中有变化，就会触发这个函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }

    },
    //当tabs标签进行切换时，就会触发，能返回两个参数，新标签的name和旧标签的name  return false就能阻止跳转
    befotrTabLeave (activeName, oldActiveName) {
      // console.log('进入' + activeName);
      // console.log('离开' + oldActiveName);
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    //当tab被选中时就会触发
    async tabClicked () {
      //当下标等于1说明访问的是  商品参数  ，这时候请求  商品参数  的数据
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'many'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }
      else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'only'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败')
        }
        this.onlyTableData = res.data

      }
    },
    //图片预览效果,点击图片就会触发
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //移除图片的操作,file是固定返回的参数，可以看下el-upload文档
    handleRemove (file) {
      console.log(file);
      //获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path
      //从pics数组中，找到这对应的索引值,找到就会返回对应饿索引值
      const i = this.addForm.pics.findIndex(x => x.pics === filePath)
      //将数组中用splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)



    },
    //图片上传成功返回的数据
    handleSuccess (response) {
      console.log(response);
      //1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      //2.  将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm);
    },
    add () {
      this.$refs.addFormRef.validate(async vaild => {
        if (!vaild) {
          return this.$message.error('请填写必要的表单项')
        }
        //深拷贝
        const form = _.cloneDeep(this.addForm)
        //因为发送的数据是以 ，分隔 的字符串，需要从数组转换成字符串
        form.goods_cat = form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }

  },
  computed: {
    //获取三级分类的id
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null

    }
  }
}

</script>
<style lang='less' scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>